ML20059G586
| ML20059G586 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 01/14/1994 |
| From: | Bowling M VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML20059G589 | List: |
| References | |
| 94-015, 94-15, NUDOCS 9401240283 | |
| Download: ML20059G586 (1) | |
Text
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e VIHOINIA EI,1 C*THIC AND POWER COMI%NY H iciiu on n, VIHOINI A 23261-January 14, 1994 j
Nuclear Regulatory Commission Serial No.94-015 Attention: Document Control Desk NL&P/MAE: R1 Washington, D.C. 20555 Docket Nos. 50-339 License Nos. NPF-7 Gentlemen:
I VIRGINIA ELECTRIC AND POWER COMPANY NORTH ANNA POWER STATION UNIT 2 MINIMUM BOLTING REQUIREMENT VOLUME CONTROL TANK MANWAY -
In our letter dated January 7,1994 (Serial No.94-008), we committed to performing a calculation to determine the minimum bolting required to maintain the structuralintegrity of the volume control tank manway. Attached is that calculation, CE-1126 Revision 0.
The manway cover is a blind flange consisting of 16 bolts (1-1/8~ diameter A-193 Grade B7). The calculation determined that based on a design pressure of 75 psig, the equivalent of one bolt, same diameter and material, is adequate to withstand the design i
pressure load. We have determined that these 16 bolts would be structurally adequate if they were 1/4~ diameter of the same material. Additionally, in the calculation we-determined that assuming all the top half of the flange bolts are non-functional, the eight bolts on the bottom half of the flange with cross sectional area equal to 3/4" diameter A-193 Grade B7 bolts would be adequate for structural integrity.
If you have any further questions, please contact us.
Very truly yours,
/)'I/ ht w)J M. L. Bowling, Manager Nuclear Licensing and Programs r
Attachment cc:
United States Nuclear Regulatory Commission t
Region 11 Suite 2900 101 Marietta Street, N. W.
-l Atlanta, Georgia 30323 i
Mr. R. D. McWhorter NRC Senior Resident inspector North Anna Power Station 94o124o283 94o114 s
g01 PDR ADOCK 05000339 Y
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